Convert each percentage into a decimal. Take the percentage and divide it by 100 by moving the decimal place left two spaces. For instance, the percentage 50 percent equals the decimal 0.50. The percentage 25 percent equals the decimal 0.25.
Multiply the two decimals together. For example, multiplying 0.50 and 0.25 together equals 0.125.
Multiply the product by 100. To multiply by 100, move the decimal place right two spaces. In this example, multiplying 0.125 by 100 equals 12.5. The product represents the final percentage of 12.5 percent.
Convert each percentage into a fraction. Take the percentage and make it the numerator, or number above the line. The denominator, or number below the line, is 100. For instance, 50 percent equals 50/100, and 25 percent equals 25/100.
Multiply the fractions by multiplying both numerators together and then multiplying the denominators. Multiplying 50 and 25 equals 1,250, and multiplying 100 and 100 equals 10,000. Therefore, the final fraction equals 1,250/10,000.
Divide the numerator by 100. The number 1,250 divided by 100 equals 12.5. This represents the final percentage of 12.5 percent.